"He was depressed about his kids. He was going through something, as we all go through, and we all deal with stress and depression differently," said Marketta Thomas.

During Thursday's press conference, Ogg said the Harris County District Attorney's Civil Rights Division presented a thorough review of the evidence regarding the case, and presented it to a grand jury.

"Law enforcement officers have very, very difficult jobs. They perform them well almost all of the time, but in this case the deputy exceeded his lawful use of force. He disregarded his training, and a man who was innocent died," Ogg said.

Brewer is facing five to 99 years or up to life in prison if he's found guilty.